The colon contraction frequency and amplitude with propellingmovement decreases, the transit time prolonged, the feces cannot be pushed to the rectum;
结肠推进性收缩的幅度频率减少、结肠蠕动无力，肠传输时间增加，粪便无法正常推送至直肠；
2
This allows the operator to retain a comfortable, stable grip on the grip handle while simultaneously propelling and controlling direction of movement.
这使得运营商能够保持一个舒适，手柄上的稳定的抓地力，同时推动和控制移动方向。
3
The stress and movement situation of V propelling rod are analyzed. The method of getting V propelling rod actual stress is introduced. The preliminary testing method is proposed.